Research on Preservation Performance of Polymer Evidence Bags for Sealing Fire Debris
10.19756/j.issn.0253-3820.241476
- VernacularTitle:聚合物物证袋封存火场残留物性能研究
- Author:
Yu-Hang JIANG
1
;
Yao LIU
;
Yu WANG
;
Yan-Ru YAO
;
Jing JIN
;
Zheng-Zhe ZANG
Author Information
1. 中国人民警察大学研究生院,廊坊 065000
- Keywords:
Gasoline identification;
Background interference;
Sealing efficacy;
Micromorphology characterization;
Cross-contamination
- From:
Chinese Journal of Analytical Chemistry
2025;53(5):765-773,中插11-中插20
- CountryChina
- Language:Chinese
-
Abstract:
Arson is classified as a violent crime,and often involves accelerants that significantly increase casualties and property damage.These accelerants,typically flammable liquids with low saturated vapor pressure,present volatile characteristic components in fire residues,making evidence preservation critical for accurate forensic analysis.In this study,the preservation performance of AMPAC(American KAPAC polyester sampling bags)and polyethylene(PE)evidence bags were evaluated under simulated field conditions(40 oC)through gas chromatography-mass spectrometry(GC-MS)technique,focusing on background interference,sealing integrity,and cross-contamination.The results demonstrated that AMPAC bags exhibited minimal background interference(C12?C14 alkanes detected after 3?7 days)and effective gasoline sealing,though slight losses of C2?C3 alkylbenzenes and trace cross-contamination were observed.In contrast,PE bags showed significant background hydrocarbons(C15?C19 alkanes)and pronounced gasoline component losses,including C2?C4 alkylbenzenes,naphthalenes,and indenes.Notably,severe cross-contamination of gasoline markers was detected in adjacent blank PE bags,with characteristic components such as C2?C4 alkylbenzenes,naphthalenes,methylnaphthalenes,dimethylnaphthalenes,indenes,indanes,methylindenes,and dimethylindenes identified,indicating substantial cross-contamination issues in PE evidence bags.Microstructural analysis revealed superior sealing in AMPAC bags attributed to their smooth,dense surface morphology compared to PE's rougher,porous structure.This study established a comprehensive evaluation framework for fire residue evidence containers,and found that PE bags were unsuitable for long-term gasoline evidence preservation due to compromised integrity.These findings provided critical references for forensic container selection in fire investigations.
